**Table 1:** Basic properties of M 83 and M 51. $D_{25}\times d_{25}$ is the optical diameter from the RC3 catalogue. $L_{\rm FIR}$ is the surface integrated far-infrared luminosity between 42.5 and 122.5 $~\mu$ m using the listed distance. F₆₀/F₁₀₀ is the IRAS color ratio of the surface integrated flux densities at $60~\mu$ m and $100~\mu$ m, corrected for extinction.
	M 83	M 51
RA(2000)	13:37:00.5	13:29:52.7
Dec(2000)	-29:51:55.3	47:11:43
Type	SAB(s)c⁽¹⁾	SA(s)bc pec⁽¹⁾
Distance [Mpc]	3.7⁽⁵⁾	9.6 ⁽⁴⁾
10'' correspond to	179 pc	465 pc
Heliocentric velocity [km s^-1]	516⁽¹⁾	463⁽¹⁾
Position Angle [deg]	45 ⁽²⁾	170
Inclination [deg]	24 ⁽²⁾	20
$D_{25}\times d_{25}$ [']	$12.9\times11.5$ ⁽¹⁾	$11.2\times6.9$ ⁽¹⁾
$L_{\rm FIR}$ [10⁹ $L_{\odot}$ ]	7.1⁽³⁾	14⁽³⁾
F₆₀/F₁₀₀	0.43⁽³⁾	0.44⁽³⁾
F₆₀ [Jy]	286⁽³⁾	85⁽³⁾

References: (1) RC3 catalogue (de Vaucouleurs et al. 1991); (2) Talbot et al. (1979), Tully (1988);
(3) Rice et al. (1988); (4) Sandage & Tammann (1975); (5) de Vaucouleurs (1979).

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